
Der Feldfernsprecher 33 - The Field Telephone 33. This manual has the details about the operation and care of the German field telephone that's in the brown Bakelite case with the crank on the side. Operation, wiring schematics, how it works mechanically and electrically, troubleshooting, testing and repairs are all here. The other small manual I have for the field telephone gives the basics; this gives the details. 15 pages of solid text, then 24 illustrations. 36 pages total. 8.5"high x 5.5"wide.
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